645611244501 has 8 divisors (see below), whose sum is σ = 863027886240. Its totient is φ = 429301049552.

The previous prime is 645611244497. The next prime is 645611244511. The reversal of 645611244501 is 105442116546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645611244501 - 2² = 645611244497 is a prime.

It is a super-2 number, since 2×645611244501² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645611244501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645611244511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276610335 + ... + 276612668.

It is an arithmetic number, because the mean of its divisors is an integer number (107878485780).

Almost surely, 2^645611244501 is an apocalyptic number.

It is an amenable number.

645611244501 is a deficient number, since it is larger than the sum of its proper divisors (217416641739).

645611244501 is a wasteful number, since it uses less digits than its factorization.

645611244501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553223395.

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 645611244501 in words is "six hundred forty-five billion, six hundred eleven million, two hundred forty-four thousand, five hundred one".